package runner

import (
	"context"
	"strings"
	"testing"
	"time"
	"unicode/utf8"
)

func TestMapExit(t *testing.T) {
	cases := map[int]Status{0: StatusOK, 1: StatusWarning, 2: StatusCritical, 3: StatusUnknown, 255: StatusUnknown}
	for code, want := range cases {
		if got := MapExit(code); got != want {
			t.Errorf("MapExit(%d)=%s want %s", code, got, want)
		}
	}
}

func TestTruncateUTF8Short(t *testing.T) {
	out, tr := TruncateUTF8([]byte("hi"), 100)
	if tr || out != "hi" {
		t.Fatalf("got %q tr=%v", out, tr)
	}
}

func TestTruncateUTF8Long(t *testing.T) {
	in := strings.Repeat("a", 9000)
	out, tr := TruncateUTF8([]byte(in), MaxOutputBytes)
	if !tr {
		t.Fatal("expected truncated")
	}
	if len([]byte(out)) > MaxOutputBytes {
		t.Fatalf("byte len %d > %d", len([]byte(out)), MaxOutputBytes)
	}
	if !strings.Contains(out, "truncated") {
		t.Fatalf("no marker: %q", out[len(out)-50:])
	}
}

func TestTruncateUTF8SanitizesInvalidBytes(t *testing.T) {
	// invalid UTF-8 bytes that json.Marshal would replace with U+FFFD (3 bytes each)
	in := append([]byte("hello"), 0xff, 0xfe, 0xfd)
	out, tr := TruncateUTF8(in, 100)
	if tr {
		t.Fatal("should fit")
	}
	if !utf8.ValidString(out) {
		t.Fatalf("output must be valid UTF-8: %q", out)
	}
}

func TestTruncateUTF8Multibyte(t *testing.T) {
	in := strings.Repeat("ё", 5000) // 2 bytes per rune = 10000 bytes
	out, tr := TruncateUTF8([]byte(in), MaxOutputBytes)
	if !tr {
		t.Fatal("expected truncated")
	}
	if !utf8.ValidString(out) {
		t.Fatal("invalid UTF-8 after truncate")
	}
	if len([]byte(out)) > MaxOutputBytes {
		t.Fatalf("byte len %d > %d", len([]byte(out)), MaxOutputBytes)
	}
}

func TestRunOK(t *testing.T) {
	r := Run(context.Background(), []string{"sh", "-c", "echo ok"}, 2*time.Second)
	if r.Status != StatusOK || r.ExitCode != 0 {
		t.Fatalf("got %+v", r)
	}
	if !strings.Contains(r.Output, "ok") {
		t.Fatalf("output: %q", r.Output)
	}
}

func TestRunWarning(t *testing.T) {
	r := Run(context.Background(), []string{"sh", "-c", "exit 1"}, 2*time.Second)
	if r.Status != StatusWarning || r.ExitCode != 1 {
		t.Fatalf("got %+v", r)
	}
}

func TestRunCritical(t *testing.T) {
	r := Run(context.Background(), []string{"sh", "-c", "exit 2"}, 2*time.Second)
	if r.Status != StatusCritical {
		t.Fatalf("got %+v", r)
	}
}

func TestRunUnknownExit(t *testing.T) {
	r := Run(context.Background(), []string{"sh", "-c", "exit 7"}, 2*time.Second)
	if r.Status != StatusUnknown || r.ExitCode != 7 {
		t.Fatalf("got %+v", r)
	}
}

func TestRunTimeout(t *testing.T) {
	r := Run(context.Background(), []string{"sh", "-c", "sleep 5"}, 200*time.Millisecond)
	if r.Status != StatusUnknown {
		t.Fatalf("got %+v", r)
	}
	if r.DurationMs > 2000 {
		t.Fatalf("duration too long: %d", r.DurationMs)
	}
}

func TestRunNoExec(t *testing.T) {
	r := Run(context.Background(), []string{"/does/not/exist/zzz"}, 1*time.Second)
	if r.Status != StatusUnknown {
		t.Fatalf("got %+v", r)
	}
}